\begin{table}%ta1
 %\renewcommand{\arraystretch}{1.3}
 \caption{Observational
  information of the XMM-Newton data. } \label{t:obs} 
  \small
 %\centerline
{\begin{tabular}{lcccccccc}
\hline
\hline
  Name & Date &  Id & Filter & \multicolumn{2}{c}{Frame} & \multicolumn{3}{c}{Net exposure (ks)}   \\
%\hline
       &      &     &        &    MOS & pn               &MOS1 & MOS2 & pn \\
\hline
  Abell~68 & 2006-03-14 & 0084230201 & Medium & FF & EFF & 24.94 & 23.81 & 18.15\\
 Abell~209 & 2001-01-15 & 0084230301 & Medium & FF & EFF & 17.33 & 16.09 & 12.80\\
 Abell~267 & 2002-01-02 & 0084230401 & Medium & FF & EFF & 16.06 & 15.74 & 10.96\\
 Abell~383 & 2002-08-17 & 0084230501 & Medium & FF & EFF & 28.07 & 28.05 & 21.50\\
 Abell~773 & 2001-04-26 & 0084230601 & Medium & FF & EFF & 13.01 & 14.68 & 15.90\\
 Abell~963 & 2001-11-02 & 0084230701 & Medium & FF & EFF & 23.82 & 24.69 & 17.92\\
Abell~1689 & 2001-12-24 & 0093030101 & Thin   & FF & EFF & 33.67 & 33.34 & 29.24\\
Abell~1763 & 2002-12-13 & 0084230901 & Medium & FF & EFF & 12.32 & 12.01 &  9.34\\
Abell~1835 & 2000-06-28 & 0098010101 & Thin   & FF & FF  & ---   & 25.27 & 24.73\\
Abell~2218 & 2002-09-28 & 0112980101 & Thin   & FF & EFF & 16.69 & 16.91 & 13.79\\
Abell~2219 & 2002-06-14 & 0112231801 & Medium & FF & EFF & --- & --- & ---\\
           & 2002-06-24 & 0112231901 & Medium & FF & EFF & --- & --- & ---\\
Abell~2390 & 2001-06-19 & 0111270101 & Thin   & FF & FF  & 10.27 & 10.03 &  8.85\\
Abell~2667 & 2003-06-21 & 0148990101 & Medium & FF & FF  & 22.21 & 22.87 & 14.10\\
\hline
  \end{tabular}}
\medskip
 The MOS1 data of Abell~1835 are in window mode,
which cannot be used for this work. The XMM-Newton observations of
Abell~2219 are flared.
\end{table}